Steam Gauge Pigtails
A steam gauge pigtail (Figure 15-46) is a length of tubing with one or more loops in it used to connect the steam gauge to the boiler. It functions as a protective device by preventing live boiler steam from coming into contact with working parts of the gauge. The steam is denied passage by condensate, which forms in the loop (or loops) of the pigtail. It is recommended that the steam gauge pigtail be filled with water before it is attached to the boiler. It should be attached to the boiler in a position where heat and vibration will be at a minimum.
Hartford Return Connection
A Hartford return connection or steam loop (Figure 15-47) is a piping arrangement used in a steam heating system to return conden- sation to the boiler. This is done to prevent excessive water loss in the boiler when a leak occurs in the return line. The Hartford return connection is described in Chapter 8, “Steam Heating Systems.”
